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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
MARK SCHEME for the June 2005 question paper
0654 CO-ORDINATED SCIENCES
0654/03
Paper 3 (Extended Theory), maximum mark 100
This mark scheme is published as an aid to teachers and students, to indicate the requirements of
the examination. It shows the basis on which Examiners were initially instructed to award marks. It
does not indicate the details of the discussions that took place at an Examiners’ meeting before
marking began. Any substantial changes to the mark scheme that arose from these discussions
will be recorded in the published Report on the Examination.
All Examiners are instructed that alternative correct answers and unexpected approaches in
candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills
demonstrated.
Mark schemes must be read in conjunction with the question papers and the Report on the
Examination.
•
CIE will not enter into discussion or correspondence in connection with these mark
schemes.
CIE is publishing the mark schemes for the June 2005 question papers for most IGCSE and GCE
Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
Grade thresholds for Syllabus 0654 (Co-ordinated Sciences) in the June 2005
examination.
maximum
mark
available
Component 3
100
minimum mark required for grade:
AA
CC
EE
FF
63
36
17
11
The threshold (minimum mark) for BB is set halfway between those for Grades AA and CC.
The threshold (minimum mark) for DD is set halfway between those for Grades CC and EE.
The threshold (minimum mark) for GG is set as many marks below the FF threshold as
the EE threshold is above it.
Grade A* does not exist at the level of an individual component.
June 2005
IGCSE
MARK SCHEME
MAXIMUM MARK: 100
SYLLABUS/COMPONENT: 0654/03
CO-ORDINATED SCIENCES
Paper 3 (Extended Theory)
Page 1
1
Mark Scheme
IGCSE – JUNE 2005
Syllabus
0654
Paper
3
(a)
using wind power
using nuclear power
advantage
no pollution/saves fossil
fuels/no CO2
produced/renewable;
one power station
provides lots of
electricity/no air
pollution;
disadvantage
need lots of
turbines/damages
landscape/not always
windy/noisy/kills birds;
waste needs safe
disposal/waste can
harm people/radiation
leaks;
[4]
(b)
(i)
(ii)
coil/wire, is moving in a magnetic field/coil experiences varying
magnetic field;
[1]
as coil turns, each side first passes the North Pole and then the South
Pole;
(induced) current flows first in one direction and then the other;
every half turn;
© University of Cambridge International Examinations 2005
max [2]
Page 2
2
Mark Scheme
IGCSE – JUNE 2005
(a)
small intestine/duodenum/ileum;
(b)
provides large surface area/has microvilli;
Syllabus
0654
Paper
3
[1]
contains, blood vessel/capillary/good blood supply;
contains lacteal;
idea of small distance between digested food and blood;
(c)
(d)
(i)
hepatic portal vein;
(ii)
1
too much glucose can harm, cells/metabolism;
2
draws water out of cells by osmosis;
3
liver converts excess glucose to glycogen;
4
stores, glycogen/carbohydrate;
5
removes excess amino acids;
6
removes/breaks down, toxins;
(i)
max [2]
[1]
max [2]
aerobic respiration;
oxygen combined with glucose;
producing carbon dioxide and water;
ref. to ATP;
(ii)
max [3]
anaerobic respiration;
glucose (broken down) to form lactic acid;
only small amount of energy released;
(iii)
1
idea that smoking makes it more difficult to get oxygen, into the
blood/into the muscles;
2
because it harms the gas exchange system/specific harm
described;
3
less oxygen carried in blood;
4
because carbon monoxide carried instead of oxygen;
© University of Cambridge International Examinations 2005
max [2]
max [2]
Page 3
3
Mark Scheme
IGCSE – JUNE 2005
(a)
(b)
Syllabus
0654
electrolyte;
anode;
[2]
(i)
neutron;
[1]
(ii)
shared pair shown;
other electrons correct;
(c)
Paper
3
(i)
[2]
react with bromine (solution)/potassium permanganate;
(orange) to colourless/(purple) to colourless;
[2]
(ii)
correct arrangement of H and Cl atoms with “hangers” left;
[1]
(iii)
1
poly(chloroethene)/thermoplastic, softens when heated/can be
remoulded;
2
Bakelite/thermoset, does not melt/becomes harder when
heated/initially softens but cannot be resoftened after
cooling/blackens;
3
(polymer) molecules in, poly(chloroethene)/thermoplastic, move
past each other because they are held in place by weak forces
of attraction between the molecules;
4
in Bakelite there is cross-linking/(covalent) bonds, between
molecules (locking the structure);
© University of Cambridge International Examinations 2005
max [3]
Page 4
4
Mark Scheme
IGCSE – JUNE 2005
(a)
Syllabus
0654
Paper
3
gamma/X rays/UV;
ionisation/is ionising radiation;
damages DNA/causes mutation;
ref to cancer;
burns skin;
(b)
(c)
(i)
[B no mark]
idea that mass:weight ratio = 10;
[1]
(ii)
A and D;
[1]
(iii)
C: least mass;
[1]
(i)
(ii)
(d)
max [2]
(i)
particles/molecules;
vibrate/compressions and rarefactions;
[2]
shock waves travel through the ground/he feels it through his feet/the
ground shakes;
[1]
time = distance/speed;
= 400 000/300 000 = 1.3(3) seconds;
(ii)
[2]
frequency = velocity/wavelength;
= 300 000/(2 x 10-3) or 300 000 000/2;
= 1.5 x 108 Hz;
© University of Cambridge International Examinations 2005
[3]
Page 5
5
(a)
Mark Scheme
IGCSE – JUNE 2005
(i)
Syllabus
0654
Paper
3
as force increases length of wool increases;
proportional;
directly (proportional);
(ii)
(b)
break/will not return to their original length/increase of length out of
proportion to force applied/pass their elastic limit;
max [2]
[1]
traps air;
acts as insulator;
less convection/less (heat loss by) radiation;
(c)
(i)
max [2]
age/diet/time of year/gender;
may affect, growth of wool/kind of wool;
[2]
group A sheep have smaller wool diameter in both areas/group B
sheep have larger diameter in both areas;
[1]
(iii)
both A and B sheep have smaller wool diameter in cool area;
[1]
(iv)
range of thicknesses;
(ii)
(results in table show that) wool can be any diameter/no clear-cut
categories for wool diameter;
use of numbers from table to support answer;
© University of Cambridge International Examinations 2005
max [2]
Page 6
6
(a)
Mark Scheme
IGCSE – JUNE 2005
(i)
Syllabus
0654
1.0 g;
idea that catalyst is not consumed;
(ii)
(b)
(c)
(i)
2 H2O2
→
2 H2O + O2 ; ; (formulae + balanced)
1
idea that, calcium/magnesium, (ions) cause hardness;
2
(hard) water, passes through/contacts, the ion exchange
material;
3
dissolved, calcium/magnesium/ions causing hardness, sticks to
resin;
4
sodium/ions not causing hardness, released into the water;
5
calcium/magnesium, replaced by other ions not causing
hardness;
[2]
[2]
max [3]
B;
more soap needed to make a lather;
(ii)
Paper
3
[2]
partially softened by boiling/some of the hardness removed by
boiling/not all the hardness removed by boiling;
might contain both temporary and permanent hardness;
may not have been boiled for a sufficient length of time to remove all
hardness;
© University of Cambridge International Examinations 2005
max [2]
Page 7
7
(a)
Mark Scheme
IGCSE – JUNE 2005
(i)
Syllabus
0654
Paper
3
R = V/I;
evidence of working (0.4/0.4);
1 ohm;
(ii)
should be a straight line/should be directly proportional;
lamp gets hot so resistance increases;
(iii)
[2]
straight line through origin;
gradient correct;
(b)
[3]
1
electrons are negative (or implication);
2
rod gains electrons;
3
electrons/negative charge, removed by friction;
4
flow of, electrons/negative charge, is an electric current;
© University of Cambridge International Examinations 2005
[2]
[4]
Page 8
8
Mark Scheme
IGCSE – JUNE 2005
(a)
Syllabus
0654
A anther/stamen;
B ovary;
(b)
(c)
Paper
3
1
insects/birds;
2
attracted by, petals/scent;
3
pick up pollen from anther/pollen falls from anther;
4
pollen deposited on stigma;
(i)
male gamete/male nucleus/pollen nucleus; (NOT grain)
(ii)
fertilisation;
[2]
max [3]
[1]
male, gamete/nucleus/sex cell, fuses with female, gamete/nucleus/sex
cell;
zygote formed;
(d)
(i)
(ii)
1
pesticides may harm the plants;
2
pesticides harm, bees/pollinating insects;
3
so less pollination;
4
pesticides kill predators of aphids;
[2]
max [2]
biological control;
use, ladybirds/predator;
which will eat aphids;
mechanical method described, e.g. spray with water;
© University of Cambridge International Examinations 2005
max [2]
Page 9
9
Mark Scheme
IGCSE – JUNE 2005
(a)
Syllabus
0654
Paper
3
would not contain manganese (di)oxide;
would not contain iron oxide;
(b)
reference to avoiding transition metal compounds/transition metal
compounds impart the colour;
[3]
(i)
two electron shells with electrons arranged 2,8;
[1]
(ii)
reference to ion having filled outer shell;
filled outer shell is stable/less tendency to change/owtte;
(iii)
Fe3+;
working to show the need for charge balance;
(c)
[2]
1
Mr CaO
2
14g is 0.25 mole of CaO;
3
use of equation e.g. 1 mole of CaO from 1 mole of CaCO3;
4
0.25 moles of CaCO3 required;
[2]
= 40 + 16 = 56;
© University of Cambridge International Examinations 2005
max [3]